Accessing high voltages (>9V) and high-power density in microbatteries with volumes below ~0.25 cm³ is challenging. At such scales energy density and voltage are highly constrained by packaging and serial integration of individual cells. Here, we demonstrate hermetically sealed, durable, compact (volume ≤ 0.165 cm³) lithium batteries (Li-LiCoO₂ chemistry) with exceptionally low package volume (10.2%) in single- (~4 V), double- (~8 V) and triple-stacked (~12 V) configurations with energy densities reaching 990 Wh Kg^-1 and 1929 Wh L^-1 (triple-stacked battery discharged at C/10) and high power density for continuous and high-rate, high-frequency pulsed discharge (~124 mW cm^-2 under continuous discharge for a triple stacked battery at C/2; ~75 mW cm^-2 under pulsed discharge for double stacked battery at 2C). We achieve the high voltage-power-energy density landscape by using the current collectors as the package and stacked bifacial electrodes containing ~95% dense ultrahigh areal capacity (~50 mAh cm^-2) electrodeposited LiCoO₂ as cathode and lithium metal as anode. We demonstrate our microbatteries under ambient conditions powering wireless communication electronics, motors, and actuators, thus paving the way towards powering extremely small microdevices.